This strategy never worked for a certain coyote!
*watch out for that falling anvil!*

But it's often Wile E. Coyote's fault that he fails, not that of ACME Products. Look at the function of an anvil, which should meet the following criteria:

Heavy

Large

Hard

The anvils we've seen meet the above criteria. It's not ACME's fault if the user causes an anvil into be sent flying. By their nature, a flying anvil will hit the ground hard. It's best to not be where it will hit.

Often, Wile E. Coyote fails to properly read the instruction book before use a product. An example are Earthquake Pills, it's only after he consumes the entire bottle that he discovered the statement in the instruction book that they don't work on road runners.

Plus, he tends to use overcomplicated plans with far too many steps, when all he needs is a simple plan. After all, he knows the Road Runner stays on the road and tends to not change direction until he stops first.

*Solitaire1 looks in the ACME Catalog and sees "The ACME Chicken Hypnotizer: Why hunt chickens when you can make them come to you?"*